Bead core and manufacture thereof



May 25, W26. 1,585,900

I C H. DESAUTELS BEAD CORE AND MANUFACTURE THEREOF iled Nov. 6, 1923 IINVENTOR ATTOR Y Patented May 25, 1926. 1,535,900

UNITED STATES PATENT OFFICE.

CHARLES H. DESAUTELS, OF SPRINGFIELD, MASSACHUSETTS, ASSIGN'OR TO THEFISK RUBBER COMPANY, OF CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

BEAID CORE AND MANUFACTURE THEREOF.

Application filed November 6, 1923. Serial No. 673,084.

This invention relates to improvements in bead. The marginal portions 12are now bead fillers of the general type shown in folded over on themain body of the fabric, 85

the patent to Dowse 1,174,238 dated March so as to enclose the strandsand to meet in 7, 1916, in which the plies of the tire carcass thecenter. A slightcrowned form is given are folded around a fillersubstantially trito the fabric by stretching the center slightly angularin form and composed of an inexat 13, preferably during the foldingstep, in tensible base preferably consisting of a pluorder to'facilitatethe next operation. rality of wire cables, and a body portion of Withthe inextensible strands enclosed in more elastic material such asrubberized the folds of the fabric the assembly is now 10 fabric. Theinvention likewise relates to a ready to be shaped to the form in whichit method whereby the improved bead filler is to be incorporated in thetire carcass. In may be made. The manner in which are the usual typeoftire casing the bead filler attained the several objects. ofsimplicity, is roughly of the shape of a right triangle. economy,strength, and facility of manufac- Although the invention is not limitedto the l ture, will appear in the following descripproduction of beadfillers of this cross-section. tional form, it will be referred to forcon- Referring now to the drawings, venience in the followingdescription. Due

Fig. 1 is a sectional view of a fabric strip; to the arch shape given tothe assembly dur- Fig. 2 is a similanview showing the aping the foldingoperation the central spar 20 plication of the inextensible strands; ofdoubled fabric has a tendency to buckle Fig. 3 is a similar view showinga later outwardly if the strands 11 are pressed to-' sta e ofmanufacture; gether. This property is availed of in shapig. 4.- isasectional view of the bead filler ing the bead to triangular form. InFig. 4 ready for incorporation into the tire casing, is shown a partialsection of a mold by. which 25 showing also one manner of compacting andthis shaping may be accomplished, it-being shaping the bead to get itinto final form; understood that the mold would be inanand i nular form,through one side only of which Fig. 5 is a side view, on a smallerscale, is the section taken. What may be termed of the completed bead,illustrating its form the anvil part of the mold has a cylindrical 80 asan endless ring. part 14 wide enough to receive the assembly Inmanufacturing the improved bead filler of Fig. 3, and a surface 15 atright angles anannular fabric strip 10 is employed; prothereto. Over thecylindrical surface 14 vided with a coating of rubber, preferably slidesthe second part 16 of the mold, this applied thereon by calendering,which will being provided with a slanting end surface 3 bond thecompleted bead filler into a 00- adapted to form the hypothenuse of thetriherent whole upon the-application of shapangular filler. As the moldis closed the ing pressure, and will stiffen the bead and buckling-initiated in the stage of manubond it to the casing uponvulcanization. facture shown in Fig. 3-of the central part The thicknessof the coating should be sufof the fabric 10 will continue with thefinal 4 ficicnt to provide rubber to close the interresult shownin Fig.4. The unvulcanized stices which would otherwise exist in the rubbercoating of the fabric being plastic finished bead, this thicknesstherefore deand adhesive a compression of short data pending on theshape and size of the bead. tion in the mold will be sufficient toset-the to be built. head in its shaped form. If desired, letter-Encircling this annular strip, which is of ing may be applied to thebead by suitable the peripheral length of the base of the tire engravingof the mold parts, so as to desigbead desired, are then placed aplurality nate for example the style and size of the 10 (two as shown)of inextensible strands 11 head fillers so made. Heating is notnecesformed endless and ring shaped. The loca-' sary in the shapingoperation, as the rubber 0 tion of the endless strands is such that freepossesses its properties of plasticity and adma'rginal portions 12 ofthe fabric are prohesiveness even when cold. I prefer for convided, thestrands being also spigced apart venience and economy to give only acold at a greater distance than in e finished pressure to the bead,leaving vulcanization to be accomplished after it has been assembledWith the rest of the elements into the tire casing.

Having thus described my invention, I claim? 1. A head filler having abase portion composed of a plurality of inextensible annular strands,each strand being covered with sheet material, and a flexible bodyportion extending outwardly from said base portion and formed solely byshaping portions of said covering material.

2. A bead unit for use in the manufacture of bead fillers, comprising aplurality of spaced inextensible annular strands and a bridge offlexible material joining the strands and crowned outwardly betweenthem, whereby the strands are adapted to be of inextensible annularstrands located in' the base portion thereof, and a covering of sheetmaterial extending around the strands and looped between them, thelooped portion of the material being compacted into a triangular bodyportion of the filler.

4. A method of making a bead filler comprising enclosing a plurality ofinextensible annular strands in a sheathing of sheet material with thelatter extending outwardly between the strands, and compacting thestrands and material to form a bead filler.

CHARLES H. DESAUTELS.

